Techno‐economic assessment of CO₂ capture from aluminum smelter emissions using PZ activated AMP solutions

Abstract

In order to reduce its greenhouse gas emissions without drastically changing currently-used processes, the primary aluminum industry will need to consider capturing CO 2 released in the electrolytic cells. In order to make the capture more economically attractive to the aluminum industry, the possibility of using a blended amine absorption solution which combines the advantages of two different amines (a fast reactivity from a cyclic polyamine, piperazine (PZ), and a high absorption capacity and low regeneration cost from a sterically-hindered alkanolamine) is considered in this work. Specific to an aluminum plant, not only the costs and benefits of a CO 2 capture facility are evaluated, but also the possibility and cost of coupling the capture process with a waste heat recovery strategy. A mixture of 0.08 g/g PZ and 0.32 g/g AMP appears to be the most appropriate, reducing the capital costs by 25 % and operating costs by 29 % compared to the use of MEA (monoethanolamine) solutions. The capture cost is evaluated to be 65.10 $/ton of CO 2 avoided (without carbon tax). A thermal integration of the capture plant within the primary aluminum smelter could further reduce the cost to 57.57 $/ton of CO 2 avoided, or equivalently, 69.56 $/ton of Al produced (without carbon tax).

Simultaneous Absorption of H2S and CO2 into the MDEA + PZ Aqueous Solution in a Rotating Packed Bed

“…Chemical absorption is a mature technique to remove acid gases from gas mixture in the end-of-pipe treatment process, − and H 2 S and CO 2 have similar molecular structure and chemical properties and therefore can be simultaneously absorbed by a chemical absorbent . The alkanolamine-based absorbents, such as monoethanolamine (MEA), diethanolamine (DEA), N -methyldiethanolamine (MDEA), − and so on, have been applied in industries for the simultaneous absorption of H 2 S and CO 2 . , Among these, MDEA has been widely used for acid gases absorption due to its large absorption capacity, low regenerative energy, good thermal degradation resistance, and low corrosivity. , …”

Techno-economic analysis of AMP/PZ solvent for CO2 capture in a biomass CHP plant: towards net negative emissions

“…Regarding the raw material costs, it should be noted that solvent degradation is excluded from the calculation because it has not been included in the chemical model that forms the base of the simulation. However, solvent losses by flue gas entrainment can be extracted from the results and are included in the OPEX based on the following unit costs: 1.8 k€/t MEA (Jilvero et al, 2014), 2.48 k€/t AMP and 4.19 k€/t PZ (Lassagne et al, 2016).…”

Analysis of Integration of MEA-Based CO2 Capture and Solar Energy System for Coal-Based Power Plants Based on Thermo-Economic Structural Theory

“…In most studies, the CO 2 capture system was researched from the perspectives of energy and efficiency performance. The CO 2 capture system was evaluated with respect to its energy aspects [43], techno-economic aspects [44][45][46] and environment effects aspects [47]. System integration of solar thermal and power generation with CO 2 capture is complex and worth further study, especially regarding the combination of exergy performance and economic performance, which can be used to evaluate the exergy and thermo-economic cost of each stream and identify improvement.…”